feat: initial commit

tests/fico.test.ts

@@ -0,0 +1,15 @@
+import { describe, it, expect } from "vitest";
+import { Fico } from "../src/Fico.js";
+
+const fico = new Fico();
+
+describe("Fico roundtrip", () => {
+  it("encode → PNG → decode should preserve data", () => {
+    const input = new TextEncoder().encode("Hello FICO 🚀");
+
+    const png = fico.toPNG(input);
+    const output = fico.fromPNG(png);
+
+    expect(output).toEqual(input);
+  });
+});